Xylem MOH2 Multi zone mixing module (obsolete) - Manual (Page 4)

4
Installation and operation manual MOH2
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Application of the MOH2 mixing module
Connection of low temperature heating systems to the boiler loop,
for example
• Floor heating systems
• Wall heating systems
Installation of the MOH2 is possible in the manifold cabinet, because
• It is very compact
• It operates very quietly
• In multifamily dwellings, the feed temperature for the low temperature
loop can be selected individually for each apartment.
Construction
The Laing mixing module MOH2 consist of a bronze cast main body, which
contains [see schematics on page 2]
• Connections for feed and return of the boiler loop
• Connections for feed and return of the low temperature loop
• Circulator
• Control valve
• Presetting knob for control valve
• Air purger as well as fill and drain valves
• Connections for all necessary sensors
• Bypass valve
Function
Floor heating loop
• The circulator 1 circulates the water through the floor heating feed con-
nection and the floor heating loops to the floor heating return connection.
Mixing
• When the mixing valve 4 opens, boiler loop feed water 8 is mixed to the
floor heating loop feed side and the same amount of water is returned
from the floor heating return side 3 to the boiler loop return side 9.
• The mixing valve adjusts the quantity of water coming from the boiler
loop to control the desired floor heating feed temperature.